package org.learn.interceptor;


import com.alibaba.fastjson.JSONObject;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.learn.config.Jwt;
import org.learn.entity.Result;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
@Component
@Slf4j
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override //目标资源方法运行前运行，返回true;放行，返回false, 不放行
    public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {

        //1.获取请求url
        String url = req.getRequestURL().toString();
        log.info("请求的url:{}",url);
        //判断请求url中是否包含login，如果包含，说明是登陆，放行
        if(url.contains("login")){
            log.info("登录操作，放行。。。");
            return true;
        }
        //获取请求头中的令牌
        String jwt = req.getHeader("token");

        //判断令牌是否存在，不存在，返回错误结果
        if(!StringUtils.hasLength(jwt)){
            log.info("请求头token为空，返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //对象转换为json
            String jsonString = JSONObject.toJSONString(error);
            resp.getWriter().write(jsonString);
            return false;
        }

        //解析token
        try {
            Jwt.parseJWT(jwt);
        }catch (Exception e){
            e.printStackTrace();
            log.info("解析令牌失败");
            Result error = Result.error("NOT_LOGIN");
            //对象转换为json
            String jsonString = JSONObject.toJSONString(error);
            resp.getWriter().write(jsonString);
            return false;
        }
        //放行
        log.info("令牌合法。");
        return true;
    }

    @Override //目标资源方法后运行
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
    }

    @Override //视图渲染完毕后运行，最后运行
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion");
    }
}
